FULL PRODUCT VERSION :
1.8.0_60

ADDITIONAL OS VERSION INFORMATION :
Windows 8.1

A DESCRIPTION OF THE PROBLEM :
The scrollbar thumb vanishes for large list in the java application. For a detailed description see:

https://bugs.openjdk.java.net/browse/JDK-8134827
https://bugs.openjdk.java.net/browse/JDK-8134829

This bug was introduced with 1.8.0_60. It worked with the previous version 1.8.0_51.

REGRESSION. Last worked in version 8u51


REPRODUCIBILITY :
This bug can be reproduced always.

CUSTOMER SUBMITTED WORKAROUND :
No workaround known.